[Material Quality]Our corner clamps for woodworking are made of aluminum alloy. accurate to 90° Rugged and durable. [Versatility] The corner clamps for woodworking align two pieces of wood, planks, metal, or glass into the clamp at a 90-degree angle, suitable for fish-tanks, photo frames, small furniture, welding, and molding. [Accuracy]90 degree clamp set allows you to make and reinforce frames with precision featuring maximum clamping range of 3-inch. The swivel jaw can rotate the clamp to adjust work-pieces to different thickness. The reinforced connection and metal diagonal connection part of the angle clamps decrease the excessive pressure which can cause breaking. Please note: the commodityslightly color difference or difference, does not affect the use, please do not mind, thank you! Colour:Black Material:Aluminum Alloy Package Contents: 4 x corner clamps for woodworking Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.